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+---- dataentry configoptions ----
+type             : constant
+name             : EMPTY_VALUE_PREFIX
+purpose          : Set a dropdown prefix which indicates no value
+allowed          : A short string
+default          : --
+status_s         :
+category         : segmentation
+----
+Using this, you can organise your attribute values to have some useful "empty" values.
+For example for your subscribers to set their country, you can put
+<code>-- Select your country</code>
+as the first country, which then returns an empty value when chosen. If you then make **country** required, choosing this value will return an error on the subscribe page.

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